I think you owe him an apology for cancelling on him that weekend in NY. You kinda broke a rule of etiquette - you shouldnt really cancel on someone just because you got a better offer. You made a promise to him and you broke it - for the kind of ongoing promise you have to always be available to your boyfriend. It was a hard choice. I think that acknowledging it now might go a long way to maintaining this relationship.

I am friends with people ive known since 1979, only because they have accepted my apology from time to time. But yeah there have also been breaks.